ul,
ol,
li {
  list-style: none;
}

.w{
    width: 1200px;
    margin: 0 auto;
}
img {
  display: block;
  width: 100%;
  height: 100%;
}

a,
a:hover,
a:active {
  text-decoration: none;
  color: black;
}

.banner1{
    position: relative;
}
.banner {
 float: left;
  width: 721px;
  height: 455px;
 
  position: absolute;
  left: 25%;
  top: 25px;
  overflow: hidden;
}

.banner ul {
  width: 500%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.banner ul::after {
  display: block;
  content: "";
  clear: both;
}

.banner ul li {
  float: left;
  width: 721px;
  height: 455px;
}

.banner ol {
  height: 50px;
  background: rgba(0, 0, 0, 0.5);
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px;
  border-radius: 10px;

  display: flex;
  justify-content: center;
  align-items: center;
}

.banner ol li {
  width: 30px;
  height: 30px;
  background: #fff;
  border-radius: 50%;
  margin: 0 10px;
  cursor: pointer;
}

.banner ol li.active {
  background: red;
}

.banner div {
  width: 100%;
  height: 50px;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);

  display: flex;
  justify-content: space-between;
  align-items: center;
}

.banner div a {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50px;
  height: 50px;
  font-size: 40px;
  /* color: orange; */
}
